/Engine/Source/Runtime/Engine/Classes/Engine/CloudStorageBase.h
Once a document has been read in, use this to return a string representing the. entire document. This should only be used if SaveDocumentWithString was used to generate the document.
virtual void ParseDocumentAsBytes ( int32 Index, [TArray](API\Runtime\Core\Containers\TArray)< uint8 > & ByteData, bool bIsForConflict )